// TODO make it an AMD module

(function(){
	if(window.JSON)
		return;
	else{
		if (typeof JSON !== 'object') {
		    JSON = {};
		}

		(function () {
		    'use strict';

		    function f(n) {
		        // Format integers to have at least two digits.
		        return n < 10 ? '0' + n : n;
		    } 

		    if (typeof Date.prototype.toJSON !== 'function') {

		        Date.prototype.toJSON = function () {

		            return isFinite(this.valueOf()) 
		                ? this.getUTCFullYear()     + '-' +
		                    f(this.getUTCMonth() + 1) + '-' +
		                    f(this.getUTCDate())      + 'T' +
		                    f(this.getUTCHours())     + ':' +
		                    f(this.getUTCMinutes())   + ':' +
		                    f(this.getUTCSeconds())   + 'Z'
		                : null;
		        };

		        String.prototype.toJSON      =
		            Number.prototype.toJSON  =
		            Boolean.prototype.toJSON = function () {
		                return this.valueOf();
		            };
		    }

		    var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
		        escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
		        gap,
		        indent,
		        meta = {    // table of character substitutions
		            '\b': '\\b',
		            '\t': '\\t',
		            '\n': '\\n',
		            '\f': '\\f',
		            '\r': '\\r',
		            '"' : '\\"',
		            '\\': '\\\\'
		        },
		        rep;


		    function quote(string) {

		// If the string contains no control characters, no quote characters, and no
		// backslash characters, then we can safely slap some quotes around it.
		// Otherwise we must also replace the offending characters with safe escape
		// sequences.

		        escapable.lastIndex = 0;
		        return escapable.test(string) ? '"' + string.replace(escapable, function (a) {
		            var c = meta[a];
		            return typeof c === 'string'
		                ? c
		                : '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
		        }) + '"' : '"' + string + '"';
		    }


		    function str(key, holder) {

		// Produce a string from holder[key].

		        var i,          // The loop counter.
		            k,          // The member key.
		            v,          // The member value.
		            length,
		            mind = gap,
		            partial,
		            value = holder[key];

		// If the value has a toJSON method, call it to obtain a replacement value.

		        if (value && typeof value === 'object' &&
		                typeof value.toJSON === 'function') {
		            value = value.toJSON(key);
		        }

		// If we were called with a replacer function, then call the replacer to
		// obtain a replacement value.

		        if (typeof rep === 'function') {
		            value = rep.call(holder, key, value);
		        }

		// What happens next depends on the value's type.

		        switch (typeof value) {
		        case 'string':
		            return quote(value);

		        case 'number':

		// JSON numbers must be finite. Encode non-finite numbers as null.

		            return isFinite(value) ? String(value) : 'null';

		        case 'boolean':
		        case 'null':

		// If the value is a boolean or null, convert it to a string. Note:
		// typeof null does not produce 'null'. The case is included here in
		// the remote chance that this gets fixed someday.

		            return String(value);

		// If the type is 'object', we might be dealing with an object or an array or
		// null.

		        case 'object':

		// Due to a specification blunder in ECMAScript, typeof null is 'object',
		// so watch out for that case.

		            if (!value) {
		                return 'null';
		            }

		// Make an array to hold the partial results of stringifying this object value.

		            gap += indent;
		            partial = [];

		// Is the value an array?

		            if (Object.prototype.toString.apply(value) === '[object Array]') {

		// The value is an array. Stringify every element. Use null as a placeholder
		// for non-JSON values.

		                length = value.length;
		                for (i = 0; i < length; i += 1) {
		                    partial[i] = str(i, value) || 'null';
		                }

		// Join all of the elements together, separated with commas, and wrap them in
		// brackets.

		                v = partial.length === 0
		                    ? '[]'
		                    : gap
		                    ? '[\n' + gap + partial.join(',\n' + gap) + '\n' + mind + ']'
		                    : '[' + partial.join(',') + ']';
		                gap = mind;
		                return v;
		            }

		// If the replacer is an array, use it to select the members to be stringified.

		            if (rep && typeof rep === 'object') {
		                length = rep.length;
		                for (i = 0; i < length; i += 1) {
		                    if (typeof rep[i] === 'string') {
		                        k = rep[i];
		                        v = str(k, value);
		                        if (v) {
		                            partial.push(quote(k) + (gap ? ': ' : ':') + v);
		                        }
		                    }
		                }
		            } else {

		// Otherwise, iterate through all of the keys in the object.

		                for (k in value) {
		                    if (Object.prototype.hasOwnProperty.call(value, k)) {
		                        v = str(k, value);
		                        if (v) {
		                            partial.push(quote(k) + (gap ? ': ' : ':') + v);
		                        }
		                    }
		                }
		            }

		// Join all of the member texts together, separated with commas,
		// and wrap them in braces.

		            v = partial.length === 0
		                ? '{}'
		                : gap
		                ? '{\n' + gap + partial.join(',\n' + gap) + '\n' + mind + '}'
		                : '{' + partial.join(',') + '}';
		            gap = mind;
		            return v;
		        }
		    }

		// If the JSON object does not yet have a stringify method, give it one.

		    if (typeof JSON.stringify !== 'function') {
		        JSON.stringify = function (value, replacer, space) {

		// The stringify method takes a value and an optional replacer, and an optional
		// space parameter, and returns a JSON text. The replacer can be a function
		// that can replace values, or an array of strings that will select the keys.
		// A default replacer method can be provided. Use of the space parameter can
		// produce text that is more easily readable.

		            var i;
		            gap = '';
		            indent = '';

		// If the space parameter is a number, make an indent string containing that
		// many spaces.

		            if (typeof space === 'number') {
		                for (i = 0; i < space; i += 1) {
		                    indent += ' ';
		                }

		// If the space parameter is a string, it will be used as the indent string.

		            } else if (typeof space === 'string') {
		                indent = space;
		            }

		// If there is a replacer, it must be a function or an array.
		// Otherwise, throw an error.

		            rep = replacer;
		            if (replacer && typeof replacer !== 'function' &&
		                    (typeof replacer !== 'object' ||
		                    typeof replacer.length !== 'number')) {
		                throw new Error('JSON.stringify');
		            }

		// Make a fake root object containing our value under the key of ''.
		// Return the result of stringifying the value.

		            return str('', {'': value});
		        };
		    }


		// If the JSON object does not yet have a parse method, give it one.

		    if (typeof JSON.parse !== 'function') {
		        JSON.parse = function (text, reviver) {

		// The parse method takes a text and an optional reviver function, and returns
		// a JavaScript value if the text is a valid JSON text.

		            var j;

		            function walk(holder, key) {

		// The walk method is used to recursively walk the resulting structure so
		// that modifications can be made.

		                var k, v, value = holder[key];
		                if (value && typeof value === 'object') {
		                    for (k in value) {
		                        if (Object.prototype.hasOwnProperty.call(value, k)) {
		                            v = walk(value, k);
		                            if (v !== undefined) {
		                                value[k] = v;
		                            } else {
		                                delete value[k];
		                            }
		                        }
		                    }
		                }
		                return reviver.call(holder, key, value);
		            }


		// Parsing happens in four stages. In the first stage, we replace certain
		// Unicode characters with escape sequences. JavaScript handles many characters
		// incorrectly, either silently deleting them, or treating them as line endings.

		            text = String(text);
		            cx.lastIndex = 0;
		            if (cx.test(text)) {
		                text = text.replace(cx, function (a) {
		                    return '\\u' +
		                        ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
		                });
		            }

		// In the second stage, we run the text against regular expressions that look
		// for non-JSON patterns. We are especially concerned with '()' and 'new'
		// because they can cause invocation, and '=' because it can cause mutation.
		// But just to be safe, we want to reject all unexpected forms.

		// We split the second stage into 4 regexp operations in order to work around
		// crippling inefficiencies in IE's and Safari's regexp engines. First we
		// replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
		// replace all simple value tokens with ']' characters. Third, we delete all
		// open brackets that follow a colon or comma or that begin the text. Finally,
		// we look to see that the remaining characters are only whitespace or ']' or
		// ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.

		            if (/^[\],:{}\s]*$/
		                    .test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@')
		                        .replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']')
		                        .replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {

		// In the third stage we use the eval function to compile the text into a
		// JavaScript structure. The '{' operator is subject to a syntactic ambiguity
		// in JavaScript: it can begin a block or an object literal. We wrap the text
		// in parens to eliminate the ambiguity.

		                j = eval('(' + text + ')');

		// In the optional fourth stage, we recursively walk the new structure, passing
		// each name/value pair to a reviver function for possible transformation.

		                return typeof reviver === 'function'
		                    ? walk({'': j}, '')
		                    : j;
		            }
 
		// If the text is not JSON parseable, then a SyntaxError is thrown.

		            throw new SyntaxError('JSON.parse');
		        };
		    }
		}());

	}
})()
